Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Superfamily Solenoidea Lamarck, 1809 1 Family Solenidae Lamarck, 1809 - razor clams 2 Family Pharidae Adams & Adams, 1856 3 Family †Rzehakiidae Korobkov, 1954